CENTAF WEATHER SWO BULLETIN 46, SPECIALIZED SUPPORT BULLETIN

File: aaceb_06.txt
Page: 06
Total Pages: 7

     5. {U) PART E: HFUS KGWC HF PROPAGATION BULLETIN
     HFUS1 KGWC 180502
     JOINT USAF/NOAA BULLETIN PREPARED AT SPACE ENVIRONMENTAL SUPPORT
     BRANCH AIR FORCE GLOBAL WEATHER CENTRAL.
     PRIMARY HF RADIO PROPAGATION REPORT ISSUED AT 1805002 JAN 91.
     PART I. SUMMARY 1800002 TO 1806002 JAN al/
     FORECAST 180600Z TO 1812002 JAN 91.
                                   			QUADRANT
                              	I    		II          			III      		     IV
    		 0 TO 90W 	    90W TO 180 		180 TO 90E 		90E TO 0
     REGION    POLAR _ N5 -   		N5         		 N5       		      N5                   
                 AURORAL 	N4    		N4          		N5/P20   	      N5
                    . MIDDLE 	N7    		N7		              N8       		      N8
                         LOW 	N8    		N8          		N8       		      N8
           EQUATORIAL 	N7                       N8/P25     		N8/P30		   N8/P30
    PART II. GENERAL DESCRIPTION OF HF RADIO PROPAGATION CONDITIONS
    OBSERVED DURING THE 24 HOUR PERIOD ENDING 17/24002 AND FORECAST
    CONDITIONS FOR THE NEXT 24 HOURS.
    PROPAGATION CONDITIONS HAVE BEEN NORMAL OR BETTER DURING THE
    PERIOD. GEOMAGNETIC CONDITIONS HAVE RANGED FROM UNSETTLED TO
    ACTIVE CONDITIONS THROUGHOUT THE DAY. AN ISOLATED SOLAR FLARE
    OCCURRED NEAR 15Z AND MAY HAVE CAUSED SHORTWAVE FADES.
    FORECAST: NO SIGNIFICANT CHANGES ARE EXPECTED DURING THE PERIOD.
    SOLAR ACTIVITY WILL CONTINUE TO RANGE FROM UNSETTLED TO ACTIVE
    CONDITIONS. THERE IS STILL A MODERATE CHANCE FOR A SOLAR FLARE
    THAT WILL BE CAPABLE OF CAUSING SHORTWAVE FADES.
    PART III. SUMMARY OF SOLAR FLARE INDUCED IONOSPHERIC DISTURBANCES
    PART IV. GENERAL DESCRIPTION OF HF PROPAGATION CONDITIONS.
    WHICH MAY HAVE CAUSED SHORT WAVE FADES IN THE SUNLIT HEMISPHERE
    DURING THE 24 HOUR PERIOD ENDING 17/2400Z JAN 91 
        START      END        CONFIRMED     FREQS AFFECTED
         17/1455Z   17/1541Z         NO              UNKNOWN
    PROBABILITY FOR THE NEXT 24 HOURS . . . MODERATE.
    PART IV. OBSERVED/FORECAST 10.7 CM FLUX AND K/AP.
    THE OBSERVED 10.7 CM FLUX FOR 17 JAN 9l WAS 207.
    THE FORECAST 10.7 CM FLUX FOR 18 19 AND 20 JAN 91
    ARE 195 190 AND 195.
    THE OBSERVED K/AP VALUE FOR 17 JAN 91 WAS 03/11.
    THE FORECAST K/AP VALUES FOR 18 19 AND 20 JAN 9l
    ARE 02/10 02/10 AND 02/10.
    SATELLITE XRAY BACKGROUND: B9.2 9.2 E MINUS 07 ERGS/CM SQ
    THE EFFECTIVE SUNSPOT NUMBER FOR 17 JAN 91 IS 129.5.
    6. (U) PART F: CHEMICAL DOWNWIND MESSAGE
    FXXX36 KGWC 181800
    DE KGWA/WFG
     POINT L 	W   	100022 311582      	POINT Q    W 060014  411401
             		X   	100018 410682               		      X  060010  510501            ~ .
             		Y   	110014 409601               		      Y  060008  509500
            		 R  	 110010 508701               		       R  070008  607500
            		 S   	120010 508701               		        S  070008  606600            -